What is the name of your pitch?
Technocrats enslave the Plane (with resistance!)

What are the major mechanical themes in your set according to your vision?
Mono-hybrid and colored artifacts, operate (new wording), sunburst, resistance versus technocrats

Cards:

Thought Tainter
4B
Artifact
B, T: Target player loses 2 life. If Thought Tainter is being operated, that player loses 4 life instead.
Operate (Whenever a creature enters the battlefield under your control, you may attach it to this. Attached creatures can’t attack or block.)

Convert the Heretic
1BB
Sorcery
As an additional cost to cast Convert the Heretic, discard an artifact card.
Destroy target nonartifact creature.
Don’t worry. We’ll help you transition into your new body. Your old one was much too… fleshy.

Organ Processor
5B
Artifact
BB, Sacrifice a creature, T: Draw a card. If Organ Processor is being operated, draw another card.
Operate (Whenever a creature enters the battlefield under your control, you may attach it to this. Attached creatures can’t attack or block.)

50 words or less:

Esper gone mad: A technocracy where the government enforces cyborgdom. When conscripted, you operate the Vilcloud, a database that searches for something only the government knows. There are resistance fighters such as Blade Augmenter. Operate is quite downside, so I made it an ETB trigger. Sunburst could be resistance mechanic.

Making Operate a free ETB effect might make it harder to play - the creature that entered the battlefield most recently is likely to be a valuable high-cost creature. Players would probably want to Operate with an outclassed low-drop that had been cast earlier in the game.